Dry matter and primary nutrient accumulation in soybeans as affected by combined Nitrogen levels

Abstract

Abstract Nodulating and non‐nodulating soybeans were grown on a Alfic Udipsamment and a Typic Hapludoll amended with 10 or 100 kg N/ha. Tissue and grain samples were analyzed to determine N2‐fixation, dry matter, and N, P, and K accumulation. Highest grain yields were associated with the highest levels of N2‐fixation and N and K accumulation in grain. The largest dry matter production was by nodulating plants grown on a high soil N regime. Nodulating plants accumulated more grain and tissue N, P, and K than non‐nodulating plants. Nitrogen stress increased P concentrations in both grain and tissue and decreased harvest indices.